You can create a list of functions then use subscripting. E.g.:
funvec <- c(sin, cos, tan)
for(i in 1:3) {
print(funvec[[i]](pi/6))
}
Just create the list with the different functions that you want to
call, then subscript that list with your n_r variable.
You can also look at ?switch, but I
Dear R Experts
I've a function which involves multiple summations, and the number of
summations depends on a
random variable named (n-r), where n is known but r is random and rn_r=3
>fx=function(x)sum(sapply(1:n_r, function(j1) {sum(sapply(1:(j1),
>function(j2){sum(sapply(1:(j2),
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